You can now explore the National Historical Geographic Information System (NHGIS) environment data in Social Explorer's reports and maps. NHGIS computed 2001, 2006 and 2011 land cover summaries for counties and census tracts from satellite imagery or aerial photography by assigning each pixel to a type of land cover, such as vegetation, wetlands, water, etc. (Learn more about the data source here.) Data scientists at Social Explorer prepared all the land cover summaries.
These dat...
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